:root {
    --dark-bg: #0f172a;
    --panel-bg: #1e293b;
    --accent: #38bdf8;
    --border: #334155;
    --text: #f8fafc;
    --text-alt: #94a3b8;
    --shadow: 0 8px 32px rgba(0,0,0,0.4);
    --radius: 14px;
    --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: system-ui, -apple-system, sans-serif; }

body {
    background: var(--dark-bg);
    color: var(--text);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    min-height: 100vh;
    font-size: 15px;
    line-height: 1.6;
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--dark-bg); border-radius: 4px; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: #7dd3fc; }

/* ---- TOP BAR ---- */
.top-bar {
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border);
    padding-bottom: 15px;
    flex-wrap: wrap;
    gap: 10px;
}
.top-bar .title-wrap { display: flex; align-items: center; gap: 20px; cursor: pointer; justify-content: flex-start; }
.top-bar h1 { font-size: 1.8rem; font-weight: 700; color: #fff; transition: 0.2s; }
.top-bar h1:hover { color: var(--accent); }
.top-bar .subtitle { font-size: 0.75rem; color: var(--text-alt); margin-top: 2px; }
.top-bar .subtitle strong { color: var(--accent); font-weight: 700; }

.hamburger-menu {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: 32px;
    height: 32px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    padding: 6px;
    transition: all 0.3s ease;
}
.hamburger-menu span { display: block; width: 100%; height: 2px; background-color: var(--text-alt); transition: all 0.3s ease; }
.hamburger-menu:hover { border-color: var(--accent); }
.hamburger-menu:hover span { background-color: var(--accent); }

.user-status { display: flex; flex-direction: column; align-items: center; gap: 2px; margin-left: auto; flex-shrink: 0; }
.user-status a:hover { color: var(--accent) !important; }

/* ---- SIDE NAV ---- */
.side-nav {
    position: fixed;
    top: 0;
    left: -300px;
    width: 280px;
    height: 100vh;
    background-color: var(--panel-bg);
    border-right: 1px solid var(--border);
    z-index: 10000;
    padding: 25px 0;
    transition: left 0.3s ease;
    box-shadow: 4px 0 15px rgba(0,0,0,0.3);
    overflow-y: auto;
}
.side-nav.open { left: 0; }
.side-nav-header { padding: 0 20px 20px; border-bottom: 1px solid var(--border); margin-bottom: 15px; }
.side-nav-header h2 { font-size: 1.1rem; color: #fff; }
.side-nav ul { list-style: none; }
.side-nav li a {
    display: block;
    padding: 12px 20px;
    color: var(--text-alt);
    text-decoration: none;
    font-size: 0.95rem;
    border-left: 3px solid transparent;
    transition: all 0.2s;
}
.side-nav li a:hover { background: rgba(56, 189, 248, 0.05); color: #fff; border-left-color: var(--accent); }

/* ---- BLOG HUB ---- */
.blog-hero {
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 40px 35px;
    text-align: center;
}
.blog-hero h1 {
    font-size: 2.2rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 10px;
    letter-spacing: -0.02em;
}
.blog-hero h1 span { color: var(--accent); }
.blog-hero p {
    color: var(--text-alt);
    font-size: 1.05rem;
    max-width: 720px;
    margin: 0 auto;
    line-height: 1.7;
}

.blog-category-section { margin-top: 10px; }

.category-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 18px 0 12px 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 20px;
}
.category-header .cat-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    background: rgba(56, 189, 248, 0.1);
    border: 1px solid rgba(56, 189, 248, 0.3);
    flex-shrink: 0;
}
.category-header h2 {
    font-size: 1.4rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: -0.01em;
}
.category-header .cat-desc {
    font-size: 0.85rem;
    color: var(--text-alt);
    margin-top: 2px;
}

.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 18px;
    margin-bottom: 30px;
}

.article-card {
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px 22px 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: border-color 0.3s, transform 0.2s, box-shadow 0.2s;
    text-decoration: none;
    color: inherit;
}
.article-card:hover {
    border-color: rgba(56, 189, 248, 0.4);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.3);
    color: inherit;
}
.article-card .card-emoji { font-size: 1.6rem; line-height: 1; }
.article-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: #fff;
    line-height: 1.4;
    transition: color 0.2s;
}
.article-card:hover h3 { color: var(--accent); }
.article-card p {
    font-size: 0.85rem;
    color: var(--text-alt);
    line-height: 1.6;
    flex: 1;
}
.article-card .card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.7rem;
    color: var(--text-alt);
    border-top: 1px solid var(--border);
    padding-top: 10px;
    margin-top: 4px;
}
.article-card .card-meta .read-time { color: var(--accent); font-weight: 600; }
.article-card .card-meta .date { opacity: 0.7; }

/* ---- ARTICLE PAGE ---- */
.blog-article {
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 40px 40px 45px;
    max-width: 860px;
    margin: 0 auto;
    width: 100%;
}
.blog-article .article-header {
    border-bottom: 1px solid var(--border);
    padding-bottom: 22px;
    margin-bottom: 28px;
}
.blog-article .article-category {
    display: inline-block;
    background: rgba(56, 189, 248, 0.1);
    color: var(--accent);
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 4px 12px;
    border-radius: 20px;
    border: 1px solid rgba(56, 189, 248, 0.25);
    margin-bottom: 14px;
}
.blog-article h1 {
    font-size: 2rem;
    font-weight: 700;
    color: #fff;
    line-height: 1.25;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}
.blog-article .article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 0.8rem;
    color: var(--text-alt);
    align-items: center;
}
.blog-article .article-meta .sep { opacity: 0.4; }

.blog-article h2 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent);
    margin-top: 34px;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.blog-article h2 .emoji-badge { font-size: 1.4rem; line-height: 1; }
.blog-article h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #e2e8f0;
    margin-top: 24px;
    margin-bottom: 8px;
}
.blog-article p {
    color: var(--text-alt);
    line-height: 1.8;
    margin-bottom: 16px;
    font-size: 0.98rem;
}
.blog-article p strong { color: #f1f5f9; font-weight: 600; }
.blog-article p em { color: #cbd5e1; }
.blog-article ul, .blog-article ol {
    color: var(--text-alt);
    line-height: 1.8;
    padding-left: 26px;
    margin-bottom: 16px;
    font-size: 0.98rem;
}
.blog-article ul li, .blog-article ol li { margin-bottom: 6px; }
.blog-article ul li strong, .blog-article ol li strong { color: #f1f5f9; }

.blog-article blockquote {
    background: rgba(56, 189, 248, 0.06);
    border-left: 4px solid var(--accent);
    padding: 16px 22px;
    border-radius: 0 8px 8px 0;
    margin: 20px 0;
    font-style: italic;
    color: #cbd5e1;
}
.blog-article blockquote p { margin-bottom: 0; color: #cbd5e1; }

.blog-article .highlight-box {
    background: rgba(56, 189, 248, 0.06);
    border-left: 4px solid var(--accent);
    padding: 18px 22px;
    border-radius: 0 8px 8px 0;
    margin: 22px 0;
}
.blog-article .highlight-box p { margin-bottom: 6px; }
.blog-article .highlight-box p:last-child { margin-bottom: 0; }

.blog-article .fun-fact {
    background: rgba(245, 158, 11, 0.06);
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-radius: 10px;
    padding: 18px 22px;
    margin: 22px 0;
}
.blog-article .fun-fact strong { color: #f59e0b; }
.blog-article .fun-fact p { margin-bottom: 0; }

.blog-article .divider {
    border: 0;
    border-top: 1px solid var(--border);
    margin: 32px 0 20px;
}

.blog-article .article-footer {
    margin-top: 36px;
    padding-top: 22px;
    border-top: 1px solid var(--border);
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: space-between;
    align-items: center;
}
.blog-article .back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--accent);
    color: #020617;
    font-weight: 700;
    font-size: 0.85rem;
    padding: 10px 18px;
    border-radius: 8px;
    transition: background 0.2s, transform 0.2s;
}
.blog-article .back-link:hover { background: #0ea5e9; transform: translateY(-1px); color: #020617; }

.blog-article .toc {
    background: var(--dark-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 18px 22px;
    margin-bottom: 28px;
}
.blog-article .toc h4 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-alt);
    margin-bottom: 10px;
}
.blog-article .toc ul { list-style: none; padding: 0; margin: 0; }
.blog-article .toc ul li { margin-bottom: 6px; }
.blog-article .toc ul li a { font-size: 0.9rem; color: var(--text-alt); }
.blog-article .toc ul li a:hover { color: var(--accent); }

/* ---- FOOTER ---- */
.site-footer {
    margin-top: 20px;
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 30px 20px;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 30px;
}
.site-footer .brand-section p { color: var(--text-alt); font-size: 0.9rem; line-height: 1.6; margin-top: 6px; }
.site-footer .brand-section .logo { font-size: 1.3rem; font-weight: 700; color: var(--accent); }
.site-footer h4 { color: var(--text); font-size: 0.9rem; font-weight: 600; margin-bottom: 10px; letter-spacing: 0.3px; }
.site-footer ul { list-style: none; padding: 0; }
.site-footer ul li { margin-bottom: 6px; }
.site-footer ul li a { color: var(--text-alt); text-decoration: none; font-size: 0.85rem; transition: color 0.2s; }
.site-footer ul li a:hover { color: var(--accent); }
.site-footer .legal-section ul li a { cursor: pointer; }
.site-footer .copyright {
    grid-column: 1 / -1;
    border-top: 1px solid var(--border);
    padding-top: 15px;
    margin-top: 10px;
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-alt);
}
.site-footer .copyright .disclaimer { margin-top: 4px; font-size: 0.7rem; color: var(--text-alt); opacity: 0.7; }
.site-footer .cookie-link { cursor: pointer; }

/* ---- RESPONSIVE ---- */
@media (max-width: 768px) {
    .blog-hero { padding: 28px 20px; }
    .blog-hero h1 { font-size: 1.6rem; }
    .blog-article { padding: 24px 20px 30px; }
    .blog-article h1 { font-size: 1.5rem; }
    .blog-article h2 { font-size: 1.2rem; }
    .article-grid { grid-template-columns: 1fr; }
    .site-footer { grid-template-columns: 1fr; gap: 20px; padding: 20px; }
    .site-footer .copyright { grid-column: 1; }
    .top-bar { flex-direction: column; align-items: flex-start; }
    .user-status { align-self: flex-end; align-items: center; }
}

@media (max-width: 480px) {
    body { padding: 10px; gap: 12px; }
    .top-bar h1 { font-size: 1.2rem; }
    .blog-article { padding: 18px 14px 24px; }
    .blog-article h1 { font-size: 1.25rem; }
    .site-footer { padding: 15px; }
}